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CVE-2024-43485 is an Important-severity denial of service vulnerability affecting .NET and Visual Studio across Windows, Linux, and macOS. The provided advisory context specifies that the flaw is in System.Text.Json and affects .NET 6.0.x and 8.0.x when deserializing JSON into models that use the [JsonExtensionData] attribute. The issue can be triggered during deserialization of crafted input and is characterized as an algorithmic complexity problem, allowing malicious JSON to consume excessive resources and degrade or halt application processing.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.